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Natasha AliNatasha Ali 

API to recognise account in third party app based on Email address and populate results in the correct Salesforce record

Hi,
I'm trying to understand and build an API that connects to a third party app where it would retrieve the results of a test the user does and send back results to Salesforce to populate the correct record (based on the email address (the unique identifier) ) with the results. How would I get started with the API callout?
The third party app has their own API documentation, and I recognise that I need to use the following method:
GET api/results/initialAssessment/{userId}/all?page={page}&recordsPerPage={recordsPerPage}
How and where would I begin in establishing this API??

Many Thanks,
Natasha